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a quick google search makes it look like it's other commen use is knive and gun handles?
it seems to me that if you can replace your exaust with a high temp plastic that could be cast in to the shape insted of stamping out shapes from flat metal sheats, forming them with a die and press, crimping them together, welding them, giving them a coat of rust protection, and repeating every 5 years as they rust and fall appart... plastic exaust sounds a bit hokey, but some plastics hold up to heat rather well, and this sounds like it could be on the top of that list.
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